Feather blade for use in rotary pumps, rotary engines, and like machines



Dec. 20, 1927. 1,653,548

J. CORBETT FEATHER BLADE FOR USE IN ROTARY PUMPS, ROTARY ENGINES, AND LIKE MACHINES Filed Jan. 27, 1927 Moms Patented Dec. 20, 1927.

UNITED STATES PATENT OFFICE.

JAMES CORBETT, OF TORONTO, OLTTARIOQCANADA, ASSIGNOR OF ONE-HALF TO BENJAMIN COHEN, OF TORONTO, CANADA. I p

FEATHER BLADE FOR UsE 1N ROTARY PUMPS, ROTARY ENGINES, AND LIKE MACHINES. v

Application filed January 27, 1927, Serial No. 164,106, and in Canada June 14, 1926.

'My invention relates to improvements in feather blades for use in rotary pumps, rotary engines and like machines whereby with simple and inexpensive means a more perfect vacuum is obtained giving a quick and positive action ;to aforesaid machines, and whereby, greater efficiency is secured and niaintainedin service ;;and where withal, the wear to the inner working casings of such pumps, rotary engines and like machines, by the employment of said improved feather blades, is reduced to a minimum.

My invention is especially applicable to rotary pumps, rotary engines and like machines constructed with movable wings or vanes, supported to work free from walls of casing; and is also applicable to small rotary pumps for air, fluids and oils; and it takes the place of gears, and loose and unsupported wings or vanes, that bear and move directly upon the inner walls of their oasings. Referring to the drawings Fig. l is a front view of a vane showing a pair of feather blades fitted thereto.

Fig. 1 is a side view thereof partly in section.

Fig. 2 is a front View of a vane showing a modified form of feather blades fitted thereto.

Fig. 2 is a side view thereof partly in section.

Fig. 3 is a front view of a discoid rotor for a rotary pump or rotary engine. In this view the rotor is illustrated keyed to a drive shaft and fitted with three sets of feather blades.

Fig. 4 is a side elevation of Figure 3, depicting the feather blades extending the full width of the rotor.

It is to be understood that the vanes and rotor illustrated in the drawings are given merely to show practical applications of the invention, and no claim is made to these parts, per se, it being apparent that the invention is susceptible of use with any type of vane or vanes centrally supported and controlled so that the working ends do not contact with the casing bore.

Referring to the drawings, in the ends of the vanes and also in the rotor, I out smooth deep slots, in close set pairs, and I make and arrange to work snugly within said slots,

thin blades of steel, bronze,fibre, celeron or other suitable material, strong enough to withstand any bending from pressures within the pump.v I

Adverting to Figs. 1 and 1 in the vane (3) intermediate of the bottom of said slots taking blades (5 and 6) I provide small circu lar vents (10) bored from each face of said vane, as means to prevent any vacuum forming to retard the sliding movements of the blades which are so arranged within the said slots to move outwardly by centrifugal force when the rotor is rotating.

Adverting to the modification shown in Flgs. 2 and 2", in the vane (41:) I show an alternate arrangement which I employ in vanes for pumps having slow rotary movements, as well as for those made for semifiuids, so as to insure the outward sliding action of the said feather blades, when in operation. Here I provide a circular cored recess (11) formed about midway on the width of said vane (4) Within which I lodge a light spiral spring 11, interposed between washers 11 the bottom end resting and pressing upon the inner edges (17) of said pair of feather blades, holding them lightly but close to the wall of the casing.

For slow motion pumps, this said arrangement of springs applies to each vane of the rotor, and the said springs, 30 arranged, may

also be in duplicate orpairs' on the vanes'in larger pumps.

It is intended to permit the'outermost Washer of each spring 11 to rest against the part (not shown in the drawings) that guides or controls the vanes by contact with the sliding faces 18 and 19 adjacent the ribs 2, and furthermore it is proposed to make the washers a snug fit in the recesses 11 so that fragments from any breakage of these springs cannot cause any'damage to any inspective of the speed of the pump. A distinctive advantage of this particular construction shown in the drawings is that the single spring of each pair of blades functions to hold them both lightly pressed against the casing and yet permits either one to yield slightly independently of the other upon encountering irregularities of the casing bore. 7 H I 7 Turning to Figs. 3 and 4, a centrifugal type of feather blade is shown applied to a rotor 12 which is'keyed to a'shar't 13. The blades are arranged in pairs, as at 14 and 15 and there are three sets disposed equidistantly around the circumference of the rotor. Each blade extends the full width of the rotor. In operation these blades are moved outwardly to the casing bore and maintained in contact therewith by centrifugal action as in the case of the blades in Figs. 1 and 1 The combination in a device of the class described, of a vane or the like, a pair of feather blades slidably mounted'in slots provided in said vane, said feather blades being located adjacent to'each other for outward movement, the said vane being provided with a recess of greater width than the blade slots and merging therein, a washer disposed in the recess so as to bear against the inner edges of the blades, a coil spring seated against said washer to urge the blades outwardly, and a washer shouldered against the opposite end of the spring,the latter washer being of a size sufiicient to close the recess.

Dated at the city of Toronto, in the coun-- ty of York, in the Province of Ontario, this 1st day of September, 1926. JAMES CORBETT. 

